================================================================== BUG: KASAN: use-after-free in ax25_fillin_cb_from_dev net/ax25/af_ax25.c:468 [inline] BUG: KASAN: use-after-free in ax25_fillin_cb+0x460/0x660 net/ax25/af_ax25.c:495 Read of size 4 at addr ffff888027743f38 by task syz.3.2145/12014 CPU: 0 PID: 12014 Comm: syz.3.2145 Not tainted 5.15.180-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 print_address_description+0x63/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x16b/0x1c0 mm/kasan/report.c:451 ax25_fillin_cb_from_dev net/ax25/af_ax25.c:468 [inline] ax25_fillin_cb+0x460/0x660 net/ax25/af_ax25.c:495 ax25_setsockopt+0xab7/0xe70 net/ax25/af_ax25.c:690 __sys_setsockopt+0x57e/0x990 net/socket.c:2203 __do_sys_setsockopt net/socket.c:2214 [inline] __se_sys_setsockopt net/socket.c:2211 [inline] __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2211 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fd50d864169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd50b6cd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fd50da7cfa0 RCX: 00007fd50d864169 RDX: 0000000000000019 RSI: 0000000000000101 RDI: 0000000000000007 RBP: 00007fd50d8e5990 R08: 0000000000000010 R09: 0000000000000000 R10: 0000200000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fd50da7cfa0 R15: 00007fffac1b3b68 Allocated by task 11827: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc+0xba/0xf0 mm/kasan/common.c:513 kasan_kmalloc include/linux/kasan.h:264 [inline] kmem_cache_alloc_trace+0x143/0x290 mm/slub.c:3247 kmalloc include/linux/slab.h:604 [inline] kzalloc include/linux/slab.h:735 [inline] ax25_dev_device_up+0x51/0x5a0 net/ax25/ax25_dev.c:55 ax25_device_event+0x4a0/0x510 net/ax25/af_ax25.c:139 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:391 __dev_notify_flags+0x1fd/0x3f0 net/core/dev.c:-1 dev_change_flags+0xe7/0x190 net/core/dev.c:8928 dev_ifsioc+0x147/0x10c0 net/core/dev_ioctl.c:324 dev_ioctl+0x504/0xf60 net/core/dev_ioctl.c:587 sock_do_ioctl+0x34f/0x5a0 net/socket.c:1154 sock_ioctl+0x484/0x770 net/socket.c:1257 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 11981: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x80 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kfree+0xf1/0x270 mm/slub.c:4559 ax25_dev_put include/net/ax25.h:302 [inline] ax25_release+0x3b3/0x840 net/ax25/af_ax25.c:1062 __sock_release net/socket.c:649 [inline] sock_close+0xcd/0x230 net/socket.c:1336 __fput+0x3fe/0x8e0 fs/file_table.c:311 task_work_run+0x129/0x1a0 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:181 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Last potentially related work creation: kasan_save_stack+0x36/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348 insert_work+0x54/0x3e0 kernel/workqueue.c:1366 __queue_work+0x963/0xd00 kernel/workqueue.c:1532 queue_work_on+0x14b/0x250 kernel/workqueue.c:1559 inet6addr_event+0xf8/0x160 drivers/infiniband/core/roce_gid_mgmt.c:883 notifier_call_chain kernel/notifier.c:83 [inline] atomic_notifier_call_chain+0x15f/0x290 kernel/notifier.c:198 ipv6_add_addr+0xb5d/0xdd0 net/ipv6/addrconf.c:1182 addrconf_add_linklocal+0x343/0x9e0 net/ipv6/addrconf.c:3242 addrconf_addr_gen+0x85b/0xc00 net/ipv6/addrconf.c:-1 addrconf_dev_config net/ipv6/addrconf.c:3418 [inline] addrconf_init_auto_addrs+0x944/0xea0 net/ipv6/addrconf.c:3496 addrconf_notify+0xabc/0xf40 net/ipv6/addrconf.c:3665 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:391 netdev_state_change+0x11b/0x190 net/core/dev.c:1440 linkwatch_do_dev+0x10c/0x160 net/core/link_watch.c:167 __linkwatch_run_queue+0x4ca/0x7f0 net/core/link_watch.c:213 linkwatch_event+0x48/0x50 net/core/link_watch.c:252 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 process_scheduled_works kernel/workqueue.c:2373 [inline] worker_thread+0xdcf/0x1280 kernel/workqueue.c:2459 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Second to last potentially related work creation: kasan_save_stack+0x36/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348 insert_work+0x54/0x3e0 kernel/workqueue.c:1366 __queue_work+0x963/0xd00 kernel/workqueue.c:1532 queue_work_on+0x14b/0x250 kernel/workqueue.c:1559 queue_work include/linux/workqueue.h:512 [inline] call_usermodehelper_exec+0x269/0x450 kernel/umh.c:435 kobject_uevent_env+0x69e/0x8d0 lib/kobject_uevent.c:633 device_add+0xa4f/0xfd0 drivers/base/core.c:3393 __video_register_device+0x3826/0x45e0 drivers/media/v4l2-core/v4l2-dev.c:1037 video_register_device include/media/v4l2-dev.h:384 [inline] vivid_create_devnodes+0x26d7/0x2f40 drivers/media/test-drivers/vivid/vivid-core.c:1721 vivid_create_instance drivers/media/test-drivers/vivid/vivid-core.c:1976 [inline] vivid_probe+0x56bc/0x72f0 drivers/media/test-drivers/vivid/vivid-core.c:2031 platform_probe+0x131/0x1b0 drivers/base/platform.c:1391 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x24e/0xb60 drivers/base/dd.c:595 __driver_probe_device+0x1a2/0x3d0 drivers/base/dd.c:755 driver_probe_device+0x50/0x420 drivers/base/dd.c:785 __driver_attach+0x479/0x690 drivers/base/dd.c:1164 bus_for_each_dev+0x17c/0x1f0 drivers/base/bus.c:303 bus_add_driver+0x334/0x600 drivers/base/bus.c:620 driver_register+0x2bf/0x3a0 drivers/base/driver.c:240 vivid_init+0x39/0x70 drivers/media/test-drivers/vivid/vivid-core.c:2161 do_one_initcall+0x22b/0x7a0 init/main.c:1302 do_initcall_level+0x157/0x210 init/main.c:1375 do_initcalls+0x49/0x90 init/main.c:1391 kernel_init_freeable+0x425/0x5c0 init/main.c:1615 kernel_init+0x19/0x290 init/main.c:1506 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 The buggy address belongs to the object at ffff888027743f00 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 56 bytes inside of 192-byte region [ffff888027743f00, ffff888027743fc0) The buggy address belongs to the page: page:ffffea00009dd0c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888027743e00 pfn:0x27743 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00007cf3c8 ffffea000071e408 ffff888017441a00 raw: ffff888027743e00 000000000010000f 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, ts 12928197837, free_ts 0 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x3b78/0x3d40 mm/page_alloc.c:4192 __alloc_pages+0x272/0x700 mm/page_alloc.c:5466 alloc_page_interleave+0x22/0x1c0 mm/mempolicy.c:2031 alloc_slab_page mm/slub.c:1775 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xbb/0x4b0 mm/slub.c:1975 ___slab_alloc+0x6f6/0xe10 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc_trace+0x1a0/0x290 mm/slub.c:3245 kmalloc include/linux/slab.h:604 [inline] kzalloc include/linux/slab.h:735 [inline] call_usermodehelper_setup+0x8a/0x260 kernel/umh.c:365 kobject_uevent_env+0x681/0x8d0 lib/kobject_uevent.c:629 device_add+0xa4f/0xfd0 drivers/base/core.c:3393 __video_register_device+0x3826/0x45e0 drivers/media/v4l2-core/v4l2-dev.c:1037 video_register_device include/media/v4l2-dev.h:384 [inline] vivid_create_devnodes+0x255e/0x2f40 drivers/media/test-drivers/vivid/vivid-core.c:1692 vivid_create_instance drivers/media/test-drivers/vivid/vivid-core.c:1976 [inline] vivid_probe+0x56bc/0x72f0 drivers/media/test-drivers/vivid/vivid-core.c:2031 platform_probe+0x131/0x1b0 drivers/base/platform.c:1391 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x24e/0xb60 drivers/base/dd.c:595 __driver_probe_device+0x1a2/0x3d0 drivers/base/dd.c:755 driver_probe_device+0x50/0x420 drivers/base/dd.c:785 page_owner free stack trace missing Memory state around the buggy address: ffff888027743e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888027743e80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888027743f00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888027743f80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888027744000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================